FD airflow
#28
Originally Posted by drivelikejehu
whats with those red tail lights? is the 92 s6 different? the whole rear bumper seems to be different on that car.
#29
Great info. Thanks for posting.
Anyone who doubts the Gen 3s rear end tendency to "lift" at high speed only needs to view the video of Racing Beat's first attempt at the land speed record back in the early 90s with their White FD. It definitely lifts from the rear (at 230 mph), and Big Jim was fortunate to walk away from the incident. Their later "Back in Black" FD sported a Porsche-like duck tail on the back which cured the lift problem all the way to 242 mph.
Anyone who doubts the Gen 3s rear end tendency to "lift" at high speed only needs to view the video of Racing Beat's first attempt at the land speed record back in the early 90s with their White FD. It definitely lifts from the rear (at 230 mph), and Big Jim was fortunate to walk away from the incident. Their later "Back in Black" FD sported a Porsche-like duck tail on the back which cured the lift problem all the way to 242 mph.
#31
Originally Posted by RCCAZ 1
Great info. Thanks for posting.
Anyone who doubts the Gen 3s rear end tendency to "lift" at high speed only needs to view the video of Racing Beat's first attempt at the land speed record back in the early 90s with their White FD. It definitely lifts from the rear (at 230 mph), and Big Jim was fortunate to walk away from the incident. Their later "Back in Black" FD sported a Porsche-like duck tail on the back which cured the lift problem all the way to 242 mph.
Anyone who doubts the Gen 3s rear end tendency to "lift" at high speed only needs to view the video of Racing Beat's first attempt at the land speed record back in the early 90s with their White FD. It definitely lifts from the rear (at 230 mph), and Big Jim was fortunate to walk away from the incident. Their later "Back in Black" FD sported a Porsche-like duck tail on the back which cured the lift problem all the way to 242 mph.
So the forces on the cars at bonneville don't align perfectly with normal aero designs.
Dave
#32
I doubt the 93/95 numbers were done with a liscense plate, so it probably won't look good, since you can't remove it from the OE '99 bumper.
Originally Posted by Noxlupus
I would love to see the differences between pre and post 99 Spec design. Has anyone published these numbers or done tests to compare them? I would like to see what the trade off really is.
#35
That is a great article. I've seen a few of Autospeed's other wool tuft articles, but those cars (Subarus and Skylines) had pretty poor aero, with tons of separation at the rear windows.
Drag coefficient is only part of the equation, my friends. Frontal Area is just as important.
Total drag = Coefficient of Drag * Frontal Area * 0.5 * Air density * (Velocity)^2
(see http://www.grc.nasa.gov/WWW/K-12/airplane/drageq.html for more info)
A Cd of 0.29 isn't uncommon for modern cars (which have been designed with the help of computer aero simulation tools), but most of them have a much greater Frontal Area than the 3rd Gen. I'm not sure about the FCs: they're a bit taller, but not quite as wide.
-s-
Drag coefficient is only part of the equation, my friends. Frontal Area is just as important.
Total drag = Coefficient of Drag * Frontal Area * 0.5 * Air density * (Velocity)^2
(see http://www.grc.nasa.gov/WWW/K-12/airplane/drageq.html for more info)
A Cd of 0.29 isn't uncommon for modern cars (which have been designed with the help of computer aero simulation tools), but most of them have a much greater Frontal Area than the 3rd Gen. I'm not sure about the FCs: they're a bit taller, but not quite as wide.
-s-
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